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IgG4-related retroperitoneal fibrosis. Low power view (Panel A). High-power view highlights the prominent population of stromal cells with mild nuclear atypia in the background of lymphocytes and plasma cells (Panel B). Obliterative phlebitis (Panel C) (arrow). Immunohistochemical stain for IgG4 showing increased numbers of IgG4 positive plasma cells (Panel D).
